Petrified Wood
Silicified Wood (SiO2)
sedimentary
Category
Mineral And Organic Gemstone
Browse mineral and organic gemstone specimens identified by the Rock Identifier community.
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Basalt with Desert Varnish
Mafic Igneous Rock with Ferromanganese Coating
igneous
Green Quartz (Prasiolite)
Crystalline Silicon Dioxide (SiO2)
mineral
Ammolite
Ammolite (Biogenic Aragonite with trace elements; fossils of Placenticeras meeki and Placenticeras intercalare)
mineral
Diamond
Native Carbon (C)
mineral
Chert (Flint with Iron Staining)
Silicon Dioxide (SiO2)
sedimentary
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
gemstone
Amazonite
Microcline (K(AlSi3O8))
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with ferric iron impurities
mineral
Emerald in Matrix
Emerald (Beryllium Aluminum Silicate - Be3Al2(SiO3)6)
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Botryoidal Chalcedony
Silicon Dioxide (SiO2)
mineral
Amazonite
Microcline (KAlSi3O8) with Pb impurities
mineral
Quartz (Citrine variety)
Silicon Dioxide (SiO2)
mineral
Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
mineral
Fire Opal (in Matrix)
Hydrated Silica (SiO2·nH2O)
mineral
Turquoise in Matrix
Hydrous phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O
mineral
Sunstone
Oligoclase (Plagioclase Feldspar), (Ca,Na)(Al,Si)4O8
mineral
Amethyst
Quartz (Silicon Dioxide with Iron impurities), SiO2
mineral
Amazonite
KAlSi3O8 (Potassium aluminum silicate - blue-green variety of Microcline)
mineral
Jasper
Silicon dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Amazonite
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Prehnite
Prehnite, Ca2Al2Si3O10(OH)2
mineral
Chert (specifically Tan/Yellow Chert)
Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)
sedimentary
Amber
Fossilized tree resin
gemstone
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Fossil Shark Tooth (Sand Tiger Shark type)
Carcharias sp. (likely Odontaspis)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic
Bivalve Fossil in Sedimentary Matrix
Fossiliferous Mudstone (Class: Bivalvia)
sedimentary
Ironstone Concretion / Limonite Node
Goethite and Limonite (FeO(OH) nH2O)
sedimentary
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Chalcedony or Quartz, SiO2)
sedimentary
Fossilized Coral
Cnidaria (Anthozoa), often replaced by Calcium Carbonate (CaCO3) or Silica (SiO2)
sedimentary
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Chert (Brecciated Chert)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO₂ / Silicon Dioxide)
mineral
Glauconitic Sandstone
Glauconitic Sandstone (contains (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary